21.   What might be of more use, and perhaps should be restricted, is information on the particular genes that cause a given microbe to be unusually deadly.

22.   Whether this particular gene, called fosB, influences human mothering is unclear.

23.   Further breeding and behavioral studies may zero in more closely on particular genes.

24.   Knowing you have a particular gene mutation may mean you have an increased risk of a disease, but how big a risk?

25.   The discovery that particular genes often seem to be involved is the latest advance in an emerging field of medical study called pharmacogenetics.

26.   The dogs were blind because they lacked a particular gene.

27.   The goal is to give crop plants particular genes to let them resist herbicides.

28.   The new work, done in mouse embryos, suggests that a particular gene crucial for early development is usually not reprogrammed properly.